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Energy-Efficient Motion Simulation of a Bioinspired Variable Stiffness Joint Emulating Elbow Function for Periodic
Yapeng Xu1, Kaishun Hao1, Caidong Wang1
1College of Mechanical and Electrical Engineering, Zhengzhou University of Light Industry, Zhengzhou 450002, China.
Biomimetics (Basel, Switzerland)
|July 27, 2026
Summary
This study bio-inspired a robotic joint to save energy by matching stiffness to load resonance. Variable stiffness matching significantly reduced energy consumption compared to rigid modes.
Area of Science:
- Robotics
- Biomechanical Engineering
- Control Systems
Background:
- Human joints exhibit energy efficiency through resonance during periodic motion.
- Robotic systems often operate at fixed stiffness, leading to potential energy inefficiencies.
- Variable stiffness mechanisms are crucial for adaptable and efficient robotic performance.
Purpose of the Study:
- To investigate energy-saving motion strategies for robotic variable stiffness joints.
- To develop a bio-inspired approach mimicking the human elbow's resonance strategy.
- To optimize robotic joint stiffness for reduced energy consumption.
Main Methods:
- Proposed a modular stiffness adjustment mechanism using Archimedean spiral grooves.
- Developed a co-simulation model (MATLAB/ADAMS) to analyze dynamic equations.
- Designed an energy-saving controller based on stiffness-frequency matching and resonance effects.
Main Results:
- Demonstrated significant reduction in joint energy consumption by aligning system anti-resonance frequency with task trajectory frequency.
- Quantified motor energy losses using a dedicated consumption model.
- Observed a surge in energy consumption in high-stiffness (rigid) mode.
Conclusions:
- Bio-inspired variable stiffness control effectively reduces robotic joint energy consumption.
- Stiffness-frequency matching is a viable strategy for energy-efficient robotic operation.
- Variable stiffness joints offer superior energy performance over traditional rigid joints.
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